Threshold Limit Value/Time Weighted Average (TLV/TWA)
Threshold Limit Value/Time Weighted Average (TLV/TWA) :
TLV express the airborne concentration of a material to which nearly all persons can be exposed day after day without adverse effects. TLV-TWA is the allowable Time Weighted Average concentration for a normal 8-hour work-day or 40-hour work week. References: The Center for Chemical Process Safety of th American Institute of Chemical Engineers. Safety Health, and Loss Prevention in Chemical Processes. 345 East 47th Street, New York, NY 10017, 1990
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